docs: def _get_logging_extra(self, duration=None, results=None):
          """Extra information for logger."""
          return {
              'duration': duration,
              'results': results,
              'observer_id': self.id,
              'viewset': '{}.{}'.format(
                  self._request.viewset_class.__module__,
                  self._request.viewset_class.__name__,
              ),
              'method': self._request.viewset_method,
              'path': self._request.path,
              'get': self._request.GET,
          }